CVE Tools
Sign in

CVE-2016-4437

Published: Jun 7, 2016Updated: Apr 22, 2026 Sources: CVE List NVD GHSANVD-CWE-noinfo
NVD MITRE
9.8CVSSCRITICAL
EPSS Score
93.1%
Top 0.2%
CISA KEV
Active Exploitation
Since Nov 3, 2021
Exploits
2 Known
Remediation
Patch Available
Am I actually vulnerable?1 Nuclei template available — see how to check your systems. How to verify

Description

Apache Shiro before 1.2.5, when a cipher key has not been configured for the "remember me" feature, allows remote attackers to execute arbitrary code or bypass intended access restrictions via an unspecified request parameter.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
Open in CVSS calculator →

Weaknesses

NVD-CWE-noinfoCWE-321

Affected Products

n/an/a
auroraapache
Mixed
Web & CMS Plugins / cms-core
shiroapache
LibraryLibrary
OSS Libraries / generic-library
fuseredhat
On-premDev Tool
DevTools & CI
jboss middleware text-only advisoriesredhat
On-prem
Operating Systems / linux-distro
apacheoss-projectUSWeb & CMS Pluginsaka apache http server, apache httpd
redhatcommercialUSOperating Systemsaka red hat
and 1 more affected products View all →

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:Nov 3, 2021
Remediation due:May 3, 2022

Required action: Apply updates per vendor instructions.

2 exploit sources identified

Exploit details including PoC links, Metasploit modules, and scanner templates are available after registration.

View exploit details
Official Patch Available

References

http://rhn.redhat.com/errata/RHSA-2016-2035.html
rhn.redhat.com
https://lists.apache.org/thread.html/ef3a800c7d727a00e04b78e2f06c5cd8960f09ca28c9b69d94c3c4c4%40%3Cannouncements.aurora.apache.org%3E
lists.apache.org
http://packetstormsecurity.com/files/137310/Apache-Shiro-1.2.4-Information-Disclosure.html
packetstormsecurity.com
and 7 more references View all →

Timeline

Published
Jun 7, 2016
Added to CISA KEV
Nov 3, 2021
Last Updated
Apr 22, 2026

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2016-4437 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows